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https://www.colourpop.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
1
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

967 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.67 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

831 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.003

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.10 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

11.46 s

Page Load Progression

2.1 s
4.3 s
6.4 s
8.5 s
10.6 s
12.8 s
14.9 s
17.0 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
11.6 MB transferred, 843 requests
FIX
11.6 MB transferred, 843 requests
Critical::
Page weighs 21.7 MB (11.6 MB transferred)
Warning::
Images are 6.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.9 MB
Warning::
JavaScript is 3.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.2 MB
Warning::
843 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.4 g CO2 per page load
11.6 MB / 2.4 MB budget
11.6 MB transferred
843 requests
2.4 g CO2 per page load
Images 6.9 MiB 59%
JavaScript 3.2 MiB 28%
Other 1002.9 KiB 8%
HTML 163.2 KiB 1%
Other 133.0 KiB 1%
Fonts 115.1 KiB 1%
Other 58.5 KiB 0%
CSS 22.0 KiB 0%
Other 14.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (11.6 MiB of 11.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
12801ms total JS execution
FIX
12801ms total JS execution
Warning::
Unattributable: 3843ms CPU time
Warning::
https://colourpop.com/: 1892ms CPU time
Warning::
https://colourpop.com/cdn/shop/t/1238/assets/chunk...: 1785ms CPU time
Warning::
https://imgs.signifyd.com/DxQKiK_6DtQ5sTsU?19e48e5...: 1226ms CPU time
Warning::
https://colourpop.com/cdn/wpm/bcfa8229ew36b6053dp1...: 387ms CPU time
Warning::
Third-party scripts: 12801ms (100% of total)

Main Thread Breakdown

Other 42% Script Evaluation 38% Style & Layout 14%
ScriptTotalScriptingParse/CompileParty
Unattributable3843ms295ms0ms3rd
https://colourpop.com/1892ms360ms14ms3rd
https://colourpop.com/cdn/shop/t/1238/assets/chunk-swiper-element-bundle-DRhDKJlJ.js1785ms472ms0ms3rd
https://imgs.signifyd.com/DxQKiK_6DtQ5sTsU?19e48e51eeab2e2d=bNmHUT7Ly5utL7hfktAYubjvvC3KWyYM1nFCORXgenOgX42BTewhCqCYNFzfowdnOjswEPJPdmmDz-fLZLm4LOJTaXrvOt-z8fjrSNyhT83VwR9j6LuPCU-vIyAGD_3Tc5RhOhvH4QBu4_qoHC6zHoD674JIjuxJ5J2c19PupWeyJzWO3oQne_oHt0Ev2lrd&jb=3d322c266a7b677f3f4e6b6677722660796f3746616c7f7a2e68796275354b62706d6f6d2460736837436278676f6f273a323b34361226ms520ms12ms3rd
https://colourpop.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js387ms331ms8ms3rd
https://cdn-static.okendo.io/reviews-widget-plus/js/modules/okendo-star-rating.c993002a.js350ms338ms1ms3rd
https://cdn-scripts.signifyd.com/o/lite.js?sessionId=hWNAdyYoGSrXVn4NOtnKirZs&ping=false&profile=true&pageURL=https%253A%252F%252Fcolourpop.com%252F349ms308ms5ms3rd
https://colourpop.com/cdn/s/trekkie.storefront.793024e5c781b83428b9784ec5054da9d22f7d7f.min.js316ms89ms9ms3rd
https://colourpop.com/cdn/shopifycloud/storefront/assets/storefront/load_feature-496de5fe.js314ms313ms0ms3rd
https://widget.gotolstoy.com/we/widget.js292ms171ms0ms3rd

Showing top 10 of 29 scripts

F
JS Bundles
Action
303 scripts, 724 KB unused
FIX
303 scripts, 724 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-727...: 104 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQK...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQK...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://shopify-extension.getredo.com/main.js?widg...: 62 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-727...: 54 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 724 KB
724 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-727142071&cx=c&gtm=4e6411143 KB104 KB (73%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQKQL2VQ154 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQKQL2VQ155 KB64 KB (41%)✓3rd
https://shopify-extension.getredo.com/main.js?widget_id=ijdkbbsinimd96r&shop=colourpop-prd.myshopify.com107 KB62 KB (58%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-727142071143 KB54 KB (38%)✓3rd
https://na-library.klarnaservices.com/v1/1.0.111/sdk.js110 KB52 KB (48%)✓3rd
https://shopify-extension.getredo.com/3831-91a24011.js49 KB35 KB (71%)✓3rd
https://shopify-extension.getredo.com/6447-8a84bb1a.js41 KB35 KB (86%)✓3rd
https://cdn.9gtb.com/script.js?rev=9b8201f60 KB34 KB (57%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB33 KB (35%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-store

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-store—Never cache this response
B
Image Optimization
360 images, 0 KB saveable
REVIEW
360 images, 0 KB saveable
Info::
All images are well-optimized
360 images 6.8 MB
0 oversized -0 KB
208 legacy format
0 missing dimensions CLS risk
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (115 KB)
PASS
3 fonts (115 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

115 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 967 ms LCP 1.7 shttps://colourpop.com/cdn/shop/t/1238/assets/VisbyCF-Medium.woffVisbyCF-Medium.woff https://colourpop.com/cdn/shop/t/1238/assets/VisbyCF-Medium.woff — 26.2 KiB — 0 ms — font-display: swaphttps://colourpop.com/cdn/shop/t/1238/assets/VisbyCF-Bold.woffVisbyCF-Bold.woff https://colourpop.com/cdn/shop/t/1238/assets/VisbyCF-Bold.woff — 25.7 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2GTStandard-MRegular.woff2 https://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2 — 63.2 KiB — 0 ms — font-display: swap
VisbyCF-Medium.woff woff swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
VisbyCF-Bold.woff woff swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GTStandard-MRegular.woff2 woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~16 KB and ~32 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
843 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 12801ms · 1255KB · €68/mo
Unattributable
Other
Costly
Execution 3843ms
Transfer 0 KB
Monthly Cost €20/mo
colourpop.com
Other
Costly
Execution 1892ms
Transfer 83 KB
Monthly Cost €10/mo
colourpop.com
Other
Costly
Execution 1785ms
Transfer 47 KB
Unused 51%
Monthly Cost €9/mo
imgs.signifyd.com
Other
Costly
Execution 1226ms
Transfer 60 KB
Monthly Cost €6/mo
colourpop.com
Other
Costly
Execution 387ms
Transfer 58 KB
Unused 43%
Monthly Cost €2/mo
cdn-static.okendo.io
Other
Costly
Execution 350ms
Transfer 5 KB
Monthly Cost €2/mo
cdn-scripts.signifyd.com
Other
Costly
Execution 349ms
Transfer 51 KB
Monthly Cost €2/mo
colourpop.com
Other
Costly
Execution 316ms
Transfer 27 KB
Monthly Cost €2/mo
colourpop.com
Other
Costly
Execution 314ms
Transfer 4 KB
Monthly Cost €2/mo
widget.gotolstoy.com
Other
Costly
Execution 292ms
Transfer 38 KB
Monthly Cost €2/mo
colourpop.com
Other
Costly
Execution 238ms
Transfer 1 KB
Monthly Cost €1/mo
jsDelivr
CDN
Costly
Execution 219ms
Transfer 21 KB
Monthly Cost €1/mo
colourpop.com
Other
Optional
Execution 164ms
Transfer 4 KB
Monthly Cost €1/mo
jsDelivr
CDN
Optional
Execution 141ms
Transfer 17 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 139ms
Transfer 143 KB
Unused 38%
Monthly Cost €1/mo
shopify-extension.getredo.com
Other
Optional
Execution 117ms
Transfer 107 KB
Unused 58%
Monthly Cost €1/mo
widget.gotolstoy.com
Other
Optional
Execution 116ms
Transfer 19 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 114ms
Transfer 154 KB
Unused 41%
Monthly Cost €1/mo
cdn-static.okendo.io
Other
Optional
Execution 112ms
Transfer 17 KB
Monthly Cost €1/mo
shopify-extension.getredo.com
Other
Optional
Execution 108ms
Transfer 43 KB
Unused 64%
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 88ms
Transfer 38 KB
Monthly Cost €0/mo
play.gotolstoy.com
Other
Optional
Execution 74ms
Transfer 79 KB
Unused 59%
Monthly Cost €0/mo
colourpop.com
Other
Optional
Execution 72ms
Transfer 4 KB
Monthly Cost €0/mo
colourpop.com
Other
Optional
Execution 69ms
Transfer 6 KB
Monthly Cost €0/mo
cdn.shopify.com
Other
Optional
Execution 62ms
Transfer 31 KB
Monthly Cost €0/mo
shopify-extension.getredo.com
Other
Optional
Execution 58ms
Transfer 49 KB
Unused 71%
Monthly Cost €0/mo
colourpop.com
Other
Optional
Execution 54ms
Transfer 1 KB
Monthly Cost €0/mo
colourpop.com
Other
Optional
Execution 53ms
Transfer 52 KB
Unused 63%
Monthly Cost €0/mo
Facebook Pixel
Advertising
Optional
Execution 50ms
Transfer 95 KB
Unused 35%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 3843ms and costs ~€20/month
  • colourpop.com adds 1892ms and costs ~€10/month
  • colourpop.com adds 1785ms and costs ~€9/month
  • imgs.signifyd.com adds 1226ms and costs ~€6/month
  • colourpop.com adds 387ms and costs ~€2/month
  • cdn-static.okendo.io adds 350ms and costs ~€2/month
  • cdn-scripts.signifyd.com adds 349ms and costs ~€2/month
  • colourpop.com adds 316ms and costs ~€2/month
  • colourpop.com adds 314ms and costs ~€2/month
  • widget.gotolstoy.com adds 292ms and costs ~€2/month
  • colourpop.com adds 238ms and costs ~€1/month
  • jsDelivr adds 219ms and costs ~€1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 3843ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 1892ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 1785ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

51% of colourpop.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

imgs.signifyd.com takes 1226ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 387ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn-static.okendo.io takes 350ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn-scripts.signifyd.com takes 349ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 316ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 314ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

widget.gotolstoy.com takes 292ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

colourpop.com takes 238ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

jsDelivr takes 219ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

58% of shopify-extension.getredo.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

64% of shopify-extension.getredo.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

59% of play.gotolstoy.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

71% of shopify-extension.getredo.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

63% of colourpop.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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